Add support for no-rtti

[hojthehedgehog]

rapidcsv.h is not compilable with no-rtti.
To support no-rtti case, switch typeid to template specialization.
Wanted to push a branch, but denied.

Possible implementation

/*
 * rapidcsv.h
 *
 * URL:      https://github.com/d99kris/rapidcsv
 * Version:  8.72
 *
 * Copyright (C) 2017-2023 Kristofer Berggren
 * All rights reserved.
 *
 * rapidcsv is distributed under the BSD 3-Clause license, see LICENSE for details.
 *
 */

#pragma once

#include <algorithm>
#include <cassert>
#include <cmath>
#ifdef HAS_CODECVT
#include <codecvt>
#include <locale>
#endif
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <limits>
#include <map>
#include <sstream>
#include <string>
#include <typeinfo>
#include <vector>

#if defined(_MSC_VER)
#include <BaseTsd.h>
typedef SSIZE_T ssize_t;
#endif

namespace rapidcsv
{
#if defined(_MSC_VER)
  static const bool sPlatformHasCR = true;
#else
  static const bool sPlatformHasCR = false;
#endif

  /**
   * @brief     Datastructure holding parameters controlling how invalid numbers (including
   *            empty strings) should be handled.
   */
  struct ConverterParams
  {
    /**
     * @brief   Constructor
     * @param   pHasDefaultConverter  specifies if conversion of non-numerical strings shall be
     *                                converted to a default numerical value, instead of causing
     *                                an exception to be thrown (default).
     * @param   pDefaultFloat         floating-point default value to represent invalid numbers.
     * @param   pDefaultInteger       integer default value to represent invalid numbers.
     * @param   pNumericLocale        specifies whether to honor LC_NUMERIC locale (default
     *                                true).
     */
    explicit ConverterParams(const bool pHasDefaultConverter = false,
                             const long double pDefaultFloat = std::numeric_limits<long double>::signaling_NaN(),
                             const long long pDefaultInteger = 0,
                             const bool pNumericLocale = true)
      : mHasDefaultConverter(pHasDefaultConverter)
      , mDefaultFloat(pDefaultFloat)
      , mDefaultInteger(pDefaultInteger)
      , mNumericLocale(pNumericLocale)
    {
    }

    /**
     * @brief   specifies if conversion of non-numerical strings shall be converted to a default
     *          numerical value, instead of causing an exception to be thrown (default).
     */
    bool mHasDefaultConverter;

    /**
     * @brief   floating-point default value to represent invalid numbers.
     */
    long double mDefaultFloat;

    /**
     * @brief   integer default value to represent invalid numbers.
     */
    long long mDefaultInteger;

    /**
     * @brief   specifies whether to honor LC_NUMERIC locale.
     */
    bool mNumericLocale;
  };

  /**
   * @brief     Exception thrown when attempting to access Document data in a datatype which
   *            is not supported by the Converter class.
   */
  class no_converter : public std::exception
  {
  public:
    /**
     * @brief   Provides details about the exception
     * @returns an explanatory string
     */
    const char* what() const throw() override
    {
      return "unsupported conversion datatype";
    }
  };

  /**
   * @brief     Class providing conversion to/from numerical datatypes and strings. Only
   *            intended for rapidcsv internal usage, but exposed externally to allow
   *            specialization for custom datatype conversions.
   */
  template<typename T>
  class Converter
  {
  public:
    /**
     * @brief   Constructor
     * @param   pConverterParams      specifies how conversion of non-numerical values to
     *                                numerical datatype shall be handled.
     */
    Converter(const ConverterParams& pConverterParams)
      : mConverterParams(pConverterParams)
    {
    }

    /**
     * @brief   Converts numerical value to string representation.
     * @param   pVal                  numerical value
     * @param   pStr                  output string
     */
    void ToStr(const T& pVal, std::string& pStr) const
    {
      throw no_converter();
    }

    /**
     * @brief   Converts string holding a numerical value to numerical datatype representation.
     * @param   pVal                  numerical value
     * @param   pStr                  output string
     */
    void ToVal(const std::string& pStr, T& pVal) const
    {
      throw no_converter();
    }

  private:
    const ConverterParams& mConverterParams;
  };

template <>
inline void Converter<std::string>::ToStr(const std::string &pVal,
                                          std::string &pStr) const {
  pStr = pVal;
}

template <>
inline void Converter<int>::ToStr(const int &pVal, std::string &pStr) const {
  std::ostringstream out;
  out << pVal;
  pStr = out.str();
}

template <>
inline void Converter<long>::ToStr(const long &pVal, std::string &pStr) const {
  std::ostringstream out;
  out << pVal;
  pStr = out.str();
}

template <>
inline void Converter<long long>::ToStr(const long long &pVal,
                                        std::string &pStr) const {
  std::ostringstream out;
  out << pVal;
  pStr = out.str();
}

template <>
inline void Converter<unsigned>::ToStr(const unsigned &pVal,
                                       std::string &pStr) const {
  std::ostringstream out;
  out << pVal;
  pStr = out.str();
}

template <>
inline void Converter<unsigned long>::ToStr(const unsigned long &pVal,
                                            std::string &pStr) const {
  std::ostringstream out;
  out << pVal;
  pStr = out.str();
}

template <>
inline void Converter<unsigned long long>::ToStr(const unsigned long long &pVal,
                                                 std::string &pStr) const {
  std::ostringstream out;
  out << pVal;
  pStr = out.str();
}

template <>
inline void Converter<long double>::ToStr(const long double &pVal,
                                          std::string &pStr) const {
  std::ostringstream out;
  out << pVal;
  pStr = out.str();
}

  template <>
  inline void Converter<char>::ToStr(const char &pVal, std::string &pStr) const {
    std::ostringstream out;
    out << pVal;
    pStr = out.str();
  }

  template <>
  inline void Converter<float>::ToStr(const float &pVal,
                                      std::string &pStr) const {
    std::ostringstream out;
    out << std::defaultfloat << std::setprecision(9) << pVal;
    pStr = out.str();
  }

  template <>
  inline void Converter<double>::ToStr(const double &pVal,
                                      std::string &pStr) const {
    std::ostringstream out;
    out << std::defaultfloat << std::setprecision(17) << pVal;
    pStr = out.str();
  }

  template <>
  inline void Converter<std::string>::ToVal(const std::string &pStr,
                                            std::string &pVal) const {
    pVal = pStr;
  }

  template <>
  inline void Converter<int>::ToVal(const std::string &pStr, int &pVal) const {
    pVal = static_cast<int>(std::stoi(pStr));
  }

  template <>
  inline void Converter<long>::ToVal(const std::string &pStr, long &pVal) const {
    pVal = static_cast<long>(std::stol(pStr));
  }

  template <>
  inline void Converter<long long>::ToVal(const std::string &pStr,
                                          long long &pVal) const {
    pVal = static_cast<long long>(std::stoll(pStr));
  }

  template <>
  inline void Converter<unsigned>::ToVal(const std::string &pStr,
                                        unsigned &pVal) const {
    pVal = static_cast<unsigned>(std::stoul(pStr));
  }

  template <>
  inline void Converter<unsigned long>::ToVal(const std::string &pStr,
                                              unsigned long &pVal) const {
    pVal = static_cast<unsigned long>(std::stoul(pStr));
  }

  template <>
  inline void
  Converter<unsigned long long>::ToVal(const std::string &pStr,
                                      unsigned long long &pVal) const {
    pVal = static_cast<unsigned long long>(std::stoull(pStr));
  }

  template <>
  inline void Converter<float>::ToVal(const std::string &pStr,
                                      float &pVal) const {
    pVal = static_cast<float>(std::stof(pStr));
  }

  template <>
  inline void Converter<double>::ToVal(const std::string &pStr,
                                      double &pVal) const {
    pVal = static_cast<double>(std::stod(pStr));
  }

  template <>
  inline void Converter<long double>::ToVal(const std::string &pStr,
                                            long double &pVal) const {
    pVal = static_cast<long double>(std::stold(pStr));
  }

  template <>
  inline void Converter<char>::ToVal(const std::string &pStr, char &pVal) const {
    pVal = static_cast<char>(pStr[0]);
  }

  template<typename T>
  using ConvFunc = std::function<void (const std::string & pStr, T & pVal)>;

  /**
   * @brief     Datastructure holding parameters controlling which row and column should be
   *            treated as labels.
   */
  struct LabelParams
  {
    /**
     * @brief   Constructor
     * @param   pColumnNameIdx        specifies the zero-based row index of the column labels, setting
     *                                it to -1 prevents column lookup by label name, and gives access
     *                                to all rows as document data. Default: 0
     * @param   pRowNameIdx           specifies the zero-based column index of the row labels, setting
     *                                it to -1 prevents row lookup by label name, and gives access
     *                                to all columns as document data. Default: -1
     */
    explicit LabelParams(const ssize_t pColumnNameIdx = 0, const ssize_t pRowNameIdx = -1)
      : mColumnNameIdx(pColumnNameIdx)
      , mRowNameIdx(pRowNameIdx)
    {
      if (mColumnNameIdx < -1)
      {
        const std::string errStr = "invalid column name index " +
          std::to_string(mColumnNameIdx) + " < -1";
        throw std::out_of_range(errStr);
      }

      if (mRowNameIdx < -1)
      {
        const std::string errStr = "invalid row name index " +
          std::to_string(mRowNameIdx) + " < -1";
        throw std::out_of_range(errStr);
      }
    }

    /**
     * @brief   specifies the zero-based row index of the column labels.
     */
    ssize_t mColumnNameIdx;

    /**
     * @brief   specifies the zero-based column index of the row labels.
     */
    ssize_t mRowNameIdx;
  };

  /**
   * @brief     Datastructure holding parameters controlling how the CSV data fields are separated.
   */
  struct SeparatorParams
  {
    /**
     * @brief   Constructor
     * @param   pSeparator            specifies the column separator (default ',').
     * @param   pTrim                 specifies whether to trim leading and trailing spaces from
     *                                cells read (default false).
     * @param   pHasCR                specifies whether a new document (i.e. not an existing document read)
     *                                should use CR/LF instead of only LF (default is to use standard
     *                                behavior of underlying platforms - CR/LF for Win, and LF for others).
     * @param   pQuotedLinebreaks     specifies whether to allow line breaks in quoted text (default false)
     * @param   pAutoQuote            specifies whether to automatically dequote data during read, and add
     *                                quotes during write (default true).
     * @param   pQuoteChar            specifies the quote character (default '\"').
     */
    explicit SeparatorParams(const char pSeparator = ',', const bool pTrim = false,
                             const bool pHasCR = sPlatformHasCR, const bool pQuotedLinebreaks = false,
                             const bool pAutoQuote = true, const char pQuoteChar = '"')
      : mSeparator(pSeparator)
      , mTrim(pTrim)
      , mHasCR(pHasCR)
      , mQuotedLinebreaks(pQuotedLinebreaks)
      , mAutoQuote(pAutoQuote)
      , mQuoteChar(pQuoteChar)
    {
    }

    /**
     * @brief   specifies the column separator.
     */
    char mSeparator;

    /**
     * @brief   specifies whether to trim leading and trailing spaces from cells read.
     */
    bool mTrim;

    /**
     * @brief   specifies whether new documents should use CR/LF instead of LF.
     */
    bool mHasCR;

    /**
     * @brief   specifies whether to allow line breaks in quoted text.
     */
    bool mQuotedLinebreaks;

    /**
     * @brief   specifies whether to automatically dequote cell data.
     */
    bool mAutoQuote;

    /**
     * @brief   specifies the quote character.
     */
    char mQuoteChar;
  };

  /**
   * @brief     Datastructure holding parameters controlling how special line formats should be
   *            treated.
   */
  struct LineReaderParams
  {
    /**
     * @brief   Constructor
     * @param   pSkipCommentLines     specifies whether to skip lines prefixed with
     *                                mCommentPrefix. Default: false
     * @param   pCommentPrefix        specifies which prefix character to indicate a comment
     *                                line. Default: #
     * @param   pSkipEmptyLines       specifies whether to skip empty lines. Default: false
     */
    explicit LineReaderParams(const bool pSkipCommentLines = false,
                              const char pCommentPrefix = '#',
                              const bool pSkipEmptyLines = false)
      : mSkipCommentLines(pSkipCommentLines)
      , mCommentPrefix(pCommentPrefix)
      , mSkipEmptyLines(pSkipEmptyLines)
    {
    }

    /**
     * @brief   specifies whether to skip lines prefixed with mCommentPrefix.
     */
    bool mSkipCommentLines;

    /**
     * @brief   specifies which prefix character to indicate a comment line.
     */
    char mCommentPrefix;

    /**
     * @brief   specifies whether to skip empty lines.
     */
    bool mSkipEmptyLines;
  };

  /**
   * @brief     Class representing a CSV document.
   */
  class Document
  {
  public:
    /**
     * @brief   Constructor
     * @param   pPath                 specifies the path of an existing CSV-file to populate the Document
     *                                data with.
     * @param   pLabelParams          specifies which row and column should be treated as labels.
     * @param   pSeparatorParams      specifies which field and row separators should be used.
     * @param   pConverterParams      specifies how invalid numbers (including empty strings) should be
     *                                handled.
     * @param   pLineReaderParams     specifies how special line formats should be treated.
     */
    explicit Document(const std::string& pPath = std::string(),
                      const LabelParams& pLabelParams = LabelParams(),
                      const SeparatorParams& pSeparatorParams = SeparatorParams(),
                      const ConverterParams& pConverterParams = ConverterParams(),
                      const LineReaderParams& pLineReaderParams = LineReaderParams())
      : mPath(pPath)
      , mLabelParams(pLabelParams)
      , mSeparatorParams(pSeparatorParams)
      , mConverterParams(pConverterParams)
      , mLineReaderParams(pLineReaderParams)
      , mData()
      , mColumnNames()
      , mRowNames()
    {
      if (!mPath.empty())
      {
        ReadCsv();
      }
    }

    /**
     * @brief   Constructor
     * @param   pStream               specifies a binary input stream to read CSV data from.
     * @param   pLabelParams          specifies which row and column should be treated as labels.
     * @param   pSeparatorParams      specifies which field and row separators should be used.
     * @param   pConverterParams      specifies how invalid numbers (including empty strings) should be
     *                                handled.
     * @param   pLineReaderParams     specifies how special line formats should be treated.
     */
    explicit Document(std::istream& pStream,
                      const LabelParams& pLabelParams = LabelParams(),
                      const SeparatorParams& pSeparatorParams = SeparatorParams(),
                      const ConverterParams& pConverterParams = ConverterParams(),
                      const LineReaderParams& pLineReaderParams = LineReaderParams())
      : mPath()
      , mLabelParams(pLabelParams)
      , mSeparatorParams(pSeparatorParams)
      , mConverterParams(pConverterParams)
      , mLineReaderParams(pLineReaderParams)
      , mData()
      , mColumnNames()
      , mRowNames()
    {
      ReadCsv(pStream);
    }

    /**
     * @brief   Read Document data from file.
     * @param   pPath                 specifies the path of an existing CSV-file to populate the Document
     *                                data with.
     * @param   pLabelParams          specifies which row and column should be treated as labels.
     * @param   pSeparatorParams      specifies which field and row separators should be used.
     * @param   pConverterParams      specifies how invalid numbers (including empty strings) should be
     *                                handled.
     * @param   pLineReaderParams     specifies how special line formats should be treated.
     */
    void Load(const std::string& pPath,
              const LabelParams& pLabelParams = LabelParams(),
              const SeparatorParams& pSeparatorParams = SeparatorParams(),
              const ConverterParams& pConverterParams = ConverterParams(),
              const LineReaderParams& pLineReaderParams = LineReaderParams())
    {
      mPath = pPath;
      mLabelParams = pLabelParams;
      mSeparatorParams = pSeparatorParams;
      mConverterParams = pConverterParams;
      mLineReaderParams = pLineReaderParams;
      ReadCsv();
    }

    /**
     * @brief   Read Document data from stream.
     * @param   pStream               specifies a binary input stream to read CSV data from.
     * @param   pLabelParams          specifies which row and column should be treated as labels.
     * @param   pSeparatorParams      specifies which field and row separators should be used.
     * @param   pConverterParams      specifies how invalid numbers (including empty strings) should be
     *                                handled.
     * @param   pLineReaderParams     specifies how special line formats should be treated.
     */
    void Load(std::istream& pStream,
              const LabelParams& pLabelParams = LabelParams(),
              const SeparatorParams& pSeparatorParams = SeparatorParams(),
              const ConverterParams& pConverterParams = ConverterParams(),
              const LineReaderParams& pLineReaderParams = LineReaderParams())
    {
      mPath = "";
      mLabelParams = pLabelParams;
      mSeparatorParams = pSeparatorParams;
      mConverterParams = pConverterParams;
      mLineReaderParams = pLineReaderParams;
      ReadCsv(pStream);
    }

    /**
     * @brief   Write Document data to file.
     * @param   pPath                 optionally specifies the path where the CSV-file will be created
     *                                (if not specified, the original path provided when creating or
     *                                loading the Document data will be used).
     */
    void Save(const std::string& pPath = std::string())
    {
      if (!pPath.empty())
      {
        mPath = pPath;
      }
      WriteCsv();
    }

    /**
     * @brief   Write Document data to stream.
     * @param   pStream               specifies a binary output stream to write the data to.
     */
    void Save(std::ostream& pStream) const
    {
      WriteCsv(pStream);
    }

    /**
     * @brief   Clears loaded Document data.
     *
     */
    void Clear()
    {
      mData.clear();
      mColumnNames.clear();
      mRowNames.clear();
#ifdef HAS_CODECVT
      mIsUtf16 = false;
      mIsLE = false;
#endif
    }

    /**
     * @brief   Get column index by name.
     * @param   pColumnName           column label name.
     * @returns zero-based column index.
     */
    ssize_t GetColumnIdx(const std::string& pColumnName) const
    {
      if (mLabelParams.mColumnNameIdx >= 0)
      {
        if (mColumnNames.find(pColumnName) != mColumnNames.end())
        {
          return static_cast<ssize_t>(mColumnNames.at(pColumnName)) - (mLabelParams.mRowNameIdx + 1);
        }
      }
      return -1;
    }

    /**
     * @brief   Get column by index.
     * @param   pColumnIdx            zero-based column index.
     * @returns vector of column data.
     */
    template<typename T>
    std::vector<T> GetColumn(const size_t pColumnIdx) const
    {
      const size_t dataColumnIdx = GetDataColumnIndex(pColumnIdx);
      std::vector<T> column;
      Converter<T> converter(mConverterParams);
      for (auto itRow = mData.begin(); itRow != mData.end(); ++itRow)
      {
        if (std::distance(mData.begin(), itRow) > mLabelParams.mColumnNameIdx)
        {
          if (dataColumnIdx < itRow->size())
          {
            T val;
            converter.ToVal(itRow->at(dataColumnIdx), val);
            column.push_back(val);
          }
          else
          {
            const std::string errStr = "requested column index " +
              std::to_string(pColumnIdx) + " >= " +
              std::to_string(itRow->size() - GetDataColumnIndex(0)) +
              " (number of columns on row index " +
              std::to_string(std::distance(mData.begin(), itRow) -
                             (mLabelParams.mColumnNameIdx + 1)) + ")";
            throw std::out_of_range(errStr);
          }
        }
      }
      return column;
    }

    /**
     * @brief   Get column by index.
     * @param   pColumnIdx            zero-based column index.
     * @param   pToVal                conversion function.
     * @returns vector of column data.
     */
    template<typename T>
    std::vector<T> GetColumn(const size_t pColumnIdx, ConvFunc<T> pToVal) const
    {
      const size_t dataColumnIdx = GetDataColumnIndex(pColumnIdx);
      std::vector<T> column;
      for (auto itRow = mData.begin(); itRow != mData.end(); ++itRow)
      {
        if (std::distance(mData.begin(), itRow) > mLabelParams.mColumnNameIdx)
        {
          T val;
          pToVal(itRow->at(dataColumnIdx), val);
          column.push_back(val);
        }
      }
      return column;
    }

    /**
     * @brief   Get column by name.
     * @param   pColumnName           column label name.
     * @returns vector of column data.
     */
    template<typename T>
    std::vector<T> GetColumn(const std::string& pColumnName) const
    {
      const ssize_t columnIdx = GetColumnIdx(pColumnName);
      if (columnIdx < 0)
      {
        throw std::out_of_range("column not found: " + pColumnName);
      }
      return GetColumn<T>(static_cast<size_t>(columnIdx));
    }

    /**
     * @brief   Get column by name.
     * @param   pColumnName           column label name.
     * @param   pToVal                conversion function.
     * @returns vector of column data.
     */
    template<typename T>
    std::vector<T> GetColumn(const std::string& pColumnName, ConvFunc<T> pToVal) const
    {
      const ssize_t columnIdx = GetColumnIdx(pColumnName);
      if (columnIdx < 0)
      {
        throw std::out_of_range("column not found: " + pColumnName);
      }
      return GetColumn<T>(static_cast<size_t>(columnIdx), pToVal);
    }

    /**
     * @brief   Set column by index.
     * @param   pColumnIdx            zero-based column index.
     * @param   pColumn               vector of column data.
     */
    template<typename T>
    void SetColumn(const size_t pColumnIdx, const std::vector<T>& pColumn)
    {
      const size_t dataColumnIdx = GetDataColumnIndex(pColumnIdx);

      while (GetDataRowIndex(pColumn.size()) > GetDataRowCount())
      {
        std::vector<std::string> row;
        row.resize(GetDataColumnCount());
        mData.push_back(row);
      }

      if ((dataColumnIdx + 1) > GetDataColumnCount())
      {
        for (auto itRow = mData.begin(); itRow != mData.end(); ++itRow)
        {
          itRow->resize(GetDataColumnIndex(dataColumnIdx + 1));
        }
      }

      Converter<T> converter(mConverterParams);
      for (auto itRow = pColumn.begin(); itRow != pColumn.end(); ++itRow)
      {
        std::string str;
        converter.ToStr(*itRow, str);
        mData.at(static_cast<size_t>(std::distance(pColumn.begin(), itRow) + mLabelParams.mColumnNameIdx + 1)).at(
          dataColumnIdx) = str;
      }
    }

    /**
     * @brief   Set column by name.
     * @param   pColumnName           column label name.
     * @param   pColumn               vector of column data.
     */
    template<typename T>
    void SetColumn(const std::string& pColumnName, const std::vector<T>& pColumn)
    {
      const ssize_t columnIdx = GetColumnIdx(pColumnName);
      if (columnIdx < 0)
      {
        throw std::out_of_range("column not found: " + pColumnName);
      }
      SetColumn<T>(static_cast<size_t>(columnIdx), pColumn);
    }

    /**
     * @brief   Remove column by index.
     * @param   pColumnIdx            zero-based column index.
     */
    void RemoveColumn(const size_t pColumnIdx)
    {
      const size_t dataColumnIdx = GetDataColumnIndex(pColumnIdx);
      for (auto itRow = mData.begin(); itRow != mData.end(); ++itRow)
      {
        itRow->erase(itRow->begin() + static_cast<ssize_t>(dataColumnIdx));
      }

      UpdateColumnNames();
    }

    /**
     * @brief   Remove column by name.
     * @param   pColumnName           column label name.
     */
    void RemoveColumn(const std::string& pColumnName)
    {
      ssize_t columnIdx = GetColumnIdx(pColumnName);
      if (columnIdx < 0)
      {
        throw std::out_of_range("column not found: " + pColumnName);
      }

      RemoveColumn(static_cast<size_t>(columnIdx));
    }

    /**
     * @brief   Insert column at specified index.
     * @param   pColumnIdx            zero-based column index.
     * @param   pColumn               vector of column data (optional argument).
     * @param   pColumnName           column label name (optional argument).
     */
    template<typename T>
    void InsertColumn(const size_t pColumnIdx, const std::vector<T>& pColumn = std::vector<T>(),
                      const std::string& pColumnName = std::string())
    {
      const size_t dataColumnIdx = GetDataColumnIndex(pColumnIdx);

      std::vector<std::string> column;
      if (pColumn.empty())
      {
        column.resize(GetDataRowCount());
      }
      else
      {
        column.resize(GetDataRowIndex(pColumn.size()));
        Converter<T> converter(mConverterParams);
        for (auto itRow = pColumn.begin(); itRow != pColumn.end(); ++itRow)
        {
          std::string str;
          converter.ToStr(*itRow, str);
          const size_t rowIdx =
            static_cast<size_t>(std::distance(pColumn.begin(), itRow) + (mLabelParams.mColumnNameIdx + 1));
          column.at(rowIdx) = str;
        }
      }

      while (column.size() > GetDataRowCount())
      {
        std::vector<std::string> row;
        const size_t columnCount = std::max<size_t>(static_cast<size_t>(mLabelParams.mColumnNameIdx + 1),
                                                    GetDataColumnCount());
        row.resize(columnCount);
        mData.push_back(row);
      }

      for (auto itRow = mData.begin(); itRow != mData.end(); ++itRow)
      {
        const size_t rowIdx = static_cast<size_t>(std::distance(mData.begin(), itRow));
        itRow->insert(itRow->begin() + static_cast<ssize_t>(dataColumnIdx), column.at(rowIdx));
      }

      if (!pColumnName.empty())
      {
        SetColumnName(pColumnIdx, pColumnName);
      }

      UpdateColumnNames();
    }

    /**
     * @brief   Get number of data columns (excluding label columns).
     * @returns column count.
     */
    size_t GetColumnCount() const
    {
      const ssize_t count = static_cast<ssize_t>((mData.size() > 0) ? mData.at(0).size() : 0) -
        (mLabelParams.mRowNameIdx + 1);
      return (count >= 0) ? static_cast<size_t>(count) : 0;
    }

    /**
     * @brief   Get row index by name.
     * @param   pRowName              row label name.
     * @returns zero-based row index.
     */
    ssize_t GetRowIdx(const std::string& pRowName) const
    {
      if (mLabelParams.mRowNameIdx >= 0)
      {
        if (mRowNames.find(pRowName) != mRowNames.end())
        {
          return static_cast<ssize_t>(mRowNames.at(pRowName)) - (mLabelParams.mColumnNameIdx + 1);
        }
      }
      return -1;
    }

    /**
     * @brief   Get row by index.
     * @param   pRowIdx               zero-based row index.
     * @returns vector of row data.
     */
    template<typename T>
    std::vector<T> GetRow(const size_t pRowIdx) const
    {
      const size_t dataRowIdx = GetDataRowIndex(pRowIdx);
      std::vector<T> row;
      Converter<T> converter(mConverterParams);
      for (auto itCol = mData.at(dataRowIdx).begin(); itCol != mData.at(dataRowIdx).end(); ++itCol)
      {
        if (std::distance(mData.at(dataRowIdx).begin(), itCol) > mLabelParams.mRowNameIdx)
        {
          T val;
          converter.ToVal(*itCol, val);
          row.push_back(val);
        }
      }
      return row;
    }

    /**
     * @brief   Get row by index.
     * @param   pRowIdx               zero-based row index.
     * @param   pToVal                conversion function.
     * @returns vector of row data.
     */
    template<typename T>
    std::vector<T> GetRow(const size_t pRowIdx, ConvFunc<T> pToVal) const
    {
      const size_t dataRowIdx = GetDataRowIndex(pRowIdx);
      std::vector<T> row;
      Converter<T> converter(mConverterParams);
      for (auto itCol = mData.at(dataRowIdx).begin(); itCol != mData.at(dataRowIdx).end(); ++itCol)
      {
        if (std::distance(mData.at(dataRowIdx).begin(), itCol) > mLabelParams.mRowNameIdx)
        {
          T val;
          pToVal(*itCol, val);
          row.push_back(val);
        }
      }
      return row;
    }

    /**
     * @brief   Get row by name.
     * @param   pRowName              row label name.
     * @returns vector of row data.
     */
    template<typename T>
    std::vector<T> GetRow(const std::string& pRowName) const
    {
      ssize_t rowIdx = GetRowIdx(pRowName);
      if (rowIdx < 0)
      {
        throw std::out_of_range("row not found: " + pRowName);
      }
      return GetRow<T>(static_cast<size_t>(rowIdx));
    }

    /**
     * @brief   Get row by name.
     * @param   pRowName              row label name.
     * @param   pToVal                conversion function.
     * @returns vector of row data.
     */
    template<typename T>
    std::vector<T> GetRow(const std::string& pRowName, ConvFunc<T> pToVal) const
    {
      ssize_t rowIdx = GetRowIdx(pRowName);
      if (rowIdx < 0)
      {
        throw std::out_of_range("row not found: " + pRowName);
      }
      return GetRow<T>(static_cast<size_t>(rowIdx), pToVal);
    }

    /**
     * @brief   Set row by index.
     * @param   pRowIdx               zero-based row index.
     * @param   pRow                  vector of row data.
     */
    template<typename T>
    void SetRow(const size_t pRowIdx, const std::vector<T>& pRow)
    {
      const size_t dataRowIdx = GetDataRowIndex(pRowIdx);

      while ((dataRowIdx + 1) > GetDataRowCount())
      {
        std::vector<std::string> row;
        row.resize(GetDataColumnCount());
        mData.push_back(row);
      }

      if (pRow.size() > GetDataColumnCount())
      {
        for (auto itRow = mData.begin(); itRow != mData.end(); ++itRow)
        {
          itRow->resize(GetDataColumnIndex(pRow.size()));
        }
      }

      Converter<T> converter(mConverterParams);
      for (auto itCol = pRow.begin(); itCol != pRow.end(); ++itCol)
      {
        std::string str;
        converter.ToStr(*itCol, str);
        mData.at(dataRowIdx).at(static_cast<size_t>(std::distance(pRow.begin(),
                                                                  itCol) + mLabelParams.mRowNameIdx + 1)) = str;
      }
    }

    /**
     * @brief   Set row by name.
     * @param   pRowName              row label name.
     * @param   pRow                  vector of row data.
     */
    template<typename T>
    void SetRow(const std::string& pRowName, const std::vector<T>& pRow)
    {
      ssize_t rowIdx = GetRowIdx(pRowName);
      if (rowIdx < 0)
      {
        throw std::out_of_range("row not found: " + pRowName);
      }
      return SetRow<T>(static_cast<size_t>(rowIdx), pRow);
    }

    /**
     * @brief   Remove row by index.
     * @param   pRowIdx               zero-based row index.
     */
    void RemoveRow(const size_t pRowIdx)
    {
      const size_t dataRowIdx = GetDataRowIndex(pRowIdx);
      mData.erase(mData.begin() + static_cast<ssize_t>(dataRowIdx));
      UpdateRowNames();
    }

    /**
     * @brief   Remove row by name.
     * @param   pRowName              row label name.
     */
    void RemoveRow(const std::string& pRowName)
    {
      ssize_t rowIdx = GetRowIdx(pRowName);
      if (rowIdx < 0)
      {
        throw std::out_of_range("row not found: " + pRowName);
      }

      RemoveRow(static_cast<size_t>(rowIdx));
    }

    /**
     * @brief   Insert row at specified index.
     * @param   pRowIdx               zero-based row index.
     * @param   pRow                  vector of row data (optional argument).
     * @param   pRowName              row label name (optional argument).
     */
    template<typename T>
    void InsertRow(const size_t pRowIdx, const std::vector<T>& pRow = std::vector<T>(),
                   const std::string& pRowName = std::string())
    {
      const size_t rowIdx = GetDataRowIndex(pRowIdx);

      std::vector<std::string> row;
      if (pRow.empty())
      {
        row.resize(GetDataColumnCount());
      }
      else
      {
        row.resize(GetDataColumnIndex(pRow.size()));
        Converter<T> converter(mConverterParams);
        for (auto itCol = pRow.begin(); itCol != pRow.end(); ++itCol)
        {
          std::string str;
          converter.ToStr(*itCol, str);
          row.at(static_cast<size_t>(std::distance(pRow.begin(), itCol) + mLabelParams.mRowNameIdx + 1)) = str;
        }
      }

      while (rowIdx > GetDataRowCount())
      {
        std::vector<std::string> tempRow;
        tempRow.resize(GetDataColumnCount());
        mData.push_back(tempRow);
      }

      mData.insert(mData.begin() + static_cast<ssize_t>(rowIdx), row);

      if (!pRowName.empty())
      {
        SetRowName(pRowIdx, pRowName);
      }

      UpdateRowNames();
    }

    /**
     * @brief   Get number of data rows (excluding label rows).
     * @returns row count.
     */
    size_t GetRowCount() const
    {
      const ssize_t count = static_cast<ssize_t>(mData.size()) - (mLabelParams.mColumnNameIdx + 1);
      return (count >= 0) ? static_cast<size_t>(count) : 0;
    }

    /**
     * @brief   Get cell by index.
     * @param   pColumnIdx            zero-based column index.
     * @param   pRowIdx               zero-based row index.
     * @returns cell data.
     */
    template<typename T>
    T GetCell(const size_t pColumnIdx, const size_t pRowIdx) const
    {
      const size_t dataColumnIdx = GetDataColumnIndex(pColumnIdx);
      const size_t dataRowIdx = GetDataRowIndex(pRowIdx);

      T val;
      Converter<T> converter(mConverterParams);
      converter.ToVal(mData.at(dataRowIdx).at(dataColumnIdx), val);
      return val;
    }

    /**
     * @brief   Get cell by index.
     * @param   pColumnIdx            zero-based column index.
     * @param   pRowIdx               zero-based row index.
     * @param   pToVal                conversion function.
     * @returns cell data.
     */
    template<typename T>
    T GetCell(const size_t pColumnIdx, const size_t pRowIdx, ConvFunc<T> pToVal) const
    {
      const size_t dataColumnIdx = GetDataColumnIndex(pColumnIdx);
      const size_t dataRowIdx = GetDataRowIndex(pRowIdx);

      T val;
      pToVal(mData.at(dataRowIdx).at(dataColumnIdx), val);
      return val;
    }

    /**
     * @brief   Get cell by name.
     * @param   pColumnName           column label name.
     * @param   pRowName              row label name.
     * @returns cell data.
     */
    template<typename T>
    T GetCell(const std::string& pColumnName, const std::string& pRowName) const
    {
      const ssize_t columnIdx = GetColumnIdx(pColumnName);
      if (columnIdx < 0)
      {
        throw std::out_of_range("column not found: " + pColumnName);
      }

      const ssize_t rowIdx = GetRowIdx(pRowName);
      if (rowIdx < 0)
      {
        throw std::out_of_range("row not found: " + pRowName);
      }

      return GetCell<T>(static_cast<size_t>(columnIdx), static_cast<size_t>(rowIdx));
    }

    /**
     * @brief   Get cell by name.
     * @param   pColumnName           column label name.
     * @param   pRowName              row label name.
     * @param   pToVal                conversion function.
     * @returns cell data.
     */
    template<typename T>
    T GetCell(const std::string& pColumnName, const std::string& pRowName, ConvFunc<T> pToVal) const
    {
      const ssize_t columnIdx = GetColumnIdx(pColumnName);
      if (columnIdx < 0)
      {
        throw std::out_of_range("column not found: " + pColumnName);
      }

      const ssize_t rowIdx = GetRowIdx(pRowName);
      if (rowIdx < 0)
      {
        throw std::out_of_range("row not found: " + pRowName);
      }

      return GetCell<T>(static_cast<size_t>(columnIdx), static_cast<size_t>(rowIdx), pToVal);
    }

    /**
     * @brief   Get cell by column name and row index.
     * @param   pColumnName           column label name.
     * @param   pRowIdx               zero-based row index.
     * @returns cell data.
     */
    template<typename T>
    T GetCell(const std::string& pColumnName, const size_t pRowIdx) const
    {
      const ssize_t columnIdx = GetColumnIdx(pColumnName);
      if (columnIdx < 0)
      {
        throw std::out_of_range("column not found: " + pColumnName);
      }

      return GetCell<T>(static_cast<size_t>(columnIdx), pRowIdx);
    }

    /**
     * @brief   Get cell by column name and row index.
     * @param   pColumnName           column label name.
     * @param   pRowIdx               zero-based row index.
     * @param   pToVal                conversion function.
     * @returns cell data.
     */
    template<typename T>
    T GetCell(const std::string& pColumnName, const size_t pRowIdx, ConvFunc<T> pToVal) const
    {
      const ssize_t columnIdx = GetColumnIdx(pColumnName);
      if (columnIdx < 0)
      {
        throw std::out_of_range("column not found: " + pColumnName);
      }

      return GetCell<T>(static_cast<size_t>(columnIdx), pRowIdx, pToVal);
    }

    /**
     * @brief   Get cell by column index and row name.
     * @param   pColumnIdx            zero-based column index.
     * @param   pRowName              row label name.
     * @returns cell data.
     */
    template<typename T>
    T GetCell(const size_t pColumnIdx, const std::string& pRowName) const
    {
      const ssize_t rowIdx = GetRowIdx(pRowName);
      if (rowIdx < 0)
      {
        throw std::out_of_range("row not found: " + pRowName);
      }

      return GetCell<T>(pColumnIdx, static_cast<size_t>(rowIdx));
    }

    /**
     * @brief   Get cell by column index and row name.
     * @param   pColumnIdx            zero-based column index.
     * @param   pRowName              row label name.
     * @param   pToVal                conversion function.
     * @returns cell data.
     */
    template<typename T>
    T GetCell(const size_t pColumnIdx, const std::string& pRowName, ConvFunc<T> pToVal) const
    {
      const ssize_t rowIdx = GetRowIdx(pRowName);
      if (rowIdx < 0)
      {
        throw std::out_of_range("row not found: " + pRowName);
      }

      return GetCell<T>(pColumnIdx, static_cast<size_t>(rowIdx), pToVal);
    }

    /**
     * @brief   Set cell by index.
     * @param   pRowIdx               zero-based row index.
     * @param   pColumnIdx            zero-based column index.
     * @param   pCell                 cell data.
     */
    template<typename T>
    void SetCell(const size_t pColumnIdx, const size_t pRowIdx, const T& pCell)
    {
      const size_t dataColumnIdx = GetDataColumnIndex(pColumnIdx);
      const size_t dataRowIdx = GetDataRowIndex(pRowIdx);

      while ((dataRowIdx + 1) > GetDataRowCount())
      {
        std::vector<std::string> row;
        row.resize(GetDataColumnCount());
        mData.push_back(row);
      }

      if ((dataColumnIdx + 1) > GetDataColumnCount())
      {
        for (auto itRow = mData.begin(); itRow != mData.end(); ++itRow)
        {
          itRow->resize(dataColumnIdx + 1);
        }
      }

      std::string str;
      Converter<T> converter(mConverterParams);
      converter.ToStr(pCell, str);
      mData.at(dataRowIdx).at(dataColumnIdx) = str;
    }

    /**
     * @brief   Set cell by name.
     * @param   pColumnName           column label name.
     * @param   pRowName              row label name.
     * @param   pCell                 cell data.
     */
    template<typename T>
    void SetCell(const std::string& pColumnName, const std::string& pRowName, const T& pCell)
    {
      const ssize_t columnIdx = GetColumnIdx(pColumnName);
      if (columnIdx < 0)
      {
        throw std::out_of_range("column not found: " + pColumnName);
      }

      const ssize_t rowIdx = GetRowIdx(pRowName);
      if (rowIdx < 0)
      {
        throw std::out_of_range("row not found: " + pRowName);
      }

      SetCell<T>(static_cast<size_t>(columnIdx), static_cast<size_t>(rowIdx), pCell);
    }

    /**
     * @brief   Get column name
     * @param   pColumnIdx            zero-based column index.
     * @returns column name.
     */
    std::string GetColumnName(const size_t pColumnIdx) const
    {
      const size_t dataColumnIdx = GetDataColumnIndex(pColumnIdx);
      if (mLabelParams.mColumnNameIdx < 0)
      {
        throw std::out_of_range("column name row index < 0: " + std::to_string(mLabelParams.mColumnNameIdx));
      }

      return mData.at(static_cast<size_t>(mLabelParams.mColumnNameIdx)).at(dataColumnIdx);
    }

    /**
     * @brief   Set column name
     * @param   pColumnIdx            zero-based column index.
     * @param   pColumnName           column name.
     */
    void SetColumnName(size_t pColumnIdx, const std::string& pColumnName)
    {
      if (mLabelParams.mColumnNameIdx < 0)
      {
        throw std::out_of_range("column name row index < 0: " + std::to_string(mLabelParams.mColumnNameIdx));
      }

      const size_t dataColumnIdx = GetDataColumnIndex(pColumnIdx);
      mColumnNames[pColumnName] = dataColumnIdx;

      // increase table size if necessary:
      const size_t rowIdx = static_cast<size_t>(mLabelParams.mColumnNameIdx);
      if (rowIdx >= mData.size())
      {
        mData.resize(rowIdx + 1);
      }
      auto& row = mData[rowIdx];
      if (dataColumnIdx >= row.size())
      {
        row.resize(dataColumnIdx + 1);
      }

      mData.at(static_cast<size_t>(mLabelParams.mColumnNameIdx)).at(dataColumnIdx) = pColumnName;
    }

    /**
     * @brief   Get column names
     * @returns vector of column names.
     */
    std::vector<std::string> GetColumnNames() const
    {
      if (mLabelParams.mColumnNameIdx >= 0)
      {
        return std::vector<std::string>(mData.at(static_cast<size_t>(mLabelParams.mColumnNameIdx)).begin() +
                                        (mLabelParams.mRowNameIdx + 1),
                                        mData.at(static_cast<size_t>(mLabelParams.mColumnNameIdx)).end());
      }

      return std::vector<std::string>();
    }

    /**
     * @brief   Get row name
     * @param   pRowIdx               zero-based column index.
     * @returns row name.
     */
    std::string GetRowName(const size_t pRowIdx) const
    {
      const size_t dataRowIdx = GetDataRowIndex(pRowIdx);
      if (mLabelParams.mRowNameIdx < 0)
      {
        throw std::out_of_range("row name column index < 0: " + std::to_string(mLabelParams.mRowNameIdx));
      }

      return mData.at(dataRowIdx).at(static_cast<size_t>(mLabelParams.mRowNameIdx));
    }

    /**
     * @brief   Set row name
     * @param   pRowIdx               zero-based row index.
     * @param   pRowName              row name.
     */
    void SetRowName(size_t pRowIdx, const std::string& pRowName)
    {
      const size_t dataRowIdx = GetDataRowIndex(pRowIdx);
      mRowNames[pRowName] = dataRowIdx;
      if (mLabelParams.mRowNameIdx < 0)
      {
        throw std::out_of_range("row name column index < 0: " + std::to_string(mLabelParams.mRowNameIdx));
      }

      // increase table size if necessary:
      if (dataRowIdx >= mData.size())
      {
        mData.resize(dataRowIdx + 1);
      }
      auto& row = mData[dataRowIdx];
      if (mLabelParams.mRowNameIdx >= static_cast<ssize_t>(row.size()))
      {
        row.resize(static_cast<size_t>(mLabelParams.mRowNameIdx) + 1);
      }

      mData.at(dataRowIdx).at(static_cast<size_t>(mLabelParams.mRowNameIdx)) = pRowName;
    }

    /**
     * @brief   Get row names
     * @returns vector of row names.
     */
    std::vector<std::string> GetRowNames() const
    {
      std::vector<std::string> rownames;
      if (mLabelParams.mRowNameIdx >= 0)
      {
        for (auto itRow = mData.begin(); itRow != mData.end(); ++itRow)
        {
          if (std::distance(mData.begin(), itRow) > mLabelParams.mColumnNameIdx)
          {
            rownames.push_back(itRow->at(static_cast<size_t>(mLabelParams.mRowNameIdx)));
          }
        }
      }
      return rownames;
    }

  private:
    void ReadCsv()
    {
      std::ifstream stream;
      stream.exceptions(std::ifstream::failbit | std::ifstream::badbit);
      stream.open(mPath, std::ios::binary);
      ReadCsv(stream);
    }

    void ReadCsv(std::istream& pStream)
    {
      Clear();
      pStream.seekg(0, std::ios::end);
      std::streamsize length = pStream.tellg();
      pStream.seekg(0, std::ios::beg);

#ifdef HAS_CODECVT
      std::vector<char> bom2b(2, '\0');
      if (length >= 2)
      {
        pStream.read(bom2b.data(), 2);
        pStream.seekg(0, std::ios::beg);
      }

      static const std::vector<char> bomU16le = { '\xff', '\xfe' };
      static const std::vector<char> bomU16be = { '\xfe', '\xff' };
      if ((bom2b == bomU16le) || (bom2b == bomU16be))
      {
        mIsUtf16 = true;
        mIsLE = (bom2b == bomU16le);

        std::wifstream wstream;
        wstream.exceptions(std::wifstream::failbit | std::wifstream::badbit);
        wstream.open(mPath, std::ios::binary);
        if (mIsLE)
        {
          wstream.imbue(std::locale(wstream.getloc(),
                                    new std::codecvt_utf16<wchar_t, 0x10ffff,
                                                           static_cast<std::codecvt_mode>(std::consume_header |
                                                                                          std::little_endian)>));
        }
        else
        {
          wstream.imbue(std::locale(wstream.getloc(),
                                    new std::codecvt_utf16<wchar_t, 0x10ffff,
                                                           std::consume_header>));
        }
        std::wstringstream wss;
        wss << wstream.rdbuf();
        std::string utf8 = ToString(wss.str());
        std::stringstream ss(utf8);
        ParseCsv(ss, static_cast<std::streamsize>(utf8.size()));
      }
      else
#endif
      {
        // check for UTF-8 Byte order mark and skip it when found
        if (length >= 3)
        {
          std::vector<char> bom3b(3, '\0');
          pStream.read(bom3b.data(), 3);
          static const std::vector<char> bomU8 = { '\xef', '\xbb', '\xbf' };
          if (bom3b != bomU8)
          {
            // file does not start with a UTF-8 Byte order mark
            pStream.seekg(0, std::ios::beg);
          }
          else
          {
            // file did start with a UTF-8 Byte order mark, simply skip it
            length -= 3;
          }
        }

        ParseCsv(pStream, length);
      }
    }

    void ParseCsv(std::istream& pStream, std::streamsize p_FileLength)
    {
      const std::streamsize bufLength = 64 * 1024;
      std::vector<char> buffer(bufLength);
      std::vector<std::string> row;
      std::string cell;
      bool quoted = false;
      int cr = 0;
      int lf = 0;

      while (p_FileLength > 0)
      {
        const std::streamsize toReadLength = std::min<std::streamsize>(p_FileLength, bufLength);
        pStream.read(buffer.data(), toReadLength);

        // With user-specified istream opened in non-binary mode on windows, we may have a
        // data length mismatch, so ensure we don't parse outside actual data length read.
        const std::streamsize readLength = pStream.gcount();
        if (readLength <= 0)
        {
          break;
        }

        for (size_t i = 0; i < static_cast<size_t>(readLength); ++i)
        {
          if (buffer[i] == mSeparatorParams.mQuoteChar)
          {
            if (cell.empty() || (cell[0] == mSeparatorParams.mQuoteChar))
            {
              quoted = !quoted;
            }
            cell += buffer[i];
          }
          else if (buffer[i] == mSeparatorParams.mSeparator)
          {
            if (!quoted)
            {
              row.push_back(Unquote(Trim(cell)));
              cell.clear();
            }
            else
            {
              cell += buffer[i];
            }
          }
          else if (buffer[i] == '\r')
          {
            if (mSeparatorParams.mQuotedLinebreaks && quoted)
            {
              cell += buffer[i];
            }
            else
            {
              ++cr;
            }
          }
          else if (buffer[i] == '\n')
          {
            if (mSeparatorParams.mQuotedLinebreaks && quoted)
            {
              cell += buffer[i];
            }
            else
            {
              ++lf;
              if (mLineReaderParams.mSkipEmptyLines && row.empty() && cell.empty())
              {
                // skip empty line
              }
              else
              {
                row.push_back(Unquote(Trim(cell)));

                if (mLineReaderParams.mSkipCommentLines && !row.at(0).empty() &&
                    (row.at(0)[0] == mLineReaderParams.mCommentPrefix))
                {
                  // skip comment line
                }
                else
                {
                  mData.push_back(row);
                }

                cell.clear();
                row.clear();
                quoted = false;
              }
            }
          }
          else
          {
            cell += buffer[i];
          }
        }
        p_FileLength -= readLength;
      }

      // Handle last line without linebreak
      if (!cell.empty() || !row.empty())
      {
        row.push_back(Unquote(Trim(cell)));
        cell.clear();
        mData.push_back(row);
        row.clear();
      }

      // Assume CR/LF if at least half the linebreaks have CR
      mSeparatorParams.mHasCR = (cr > (lf / 2));

      // Set up column labels
      UpdateColumnNames();

      // Set up row labels
      UpdateRowNames();
    }

    void WriteCsv() const
    {
#ifdef HAS_CODECVT
      if (mIsUtf16)
      {
        std::stringstream ss;
        WriteCsv(ss);
        std::string utf8 = ss.str();
        std::wstring wstr = ToWString(utf8);

        std::wofstream wstream;
        wstream.exceptions(std::wofstream::failbit | std::wofstream::badbit);
        wstream.open(mPath, std::ios::binary | std::ios::trunc);

        if (mIsLE)
        {
          wstream.imbue(std::locale(wstream.getloc(),
                                    new std::codecvt_utf16<wchar_t, 0x10ffff,
                                                           static_cast<std::codecvt_mode>(std::little_endian)>));
        }
        else
        {
          wstream.imbue(std::locale(wstream.getloc(),
                                    new std::codecvt_utf16<wchar_t, 0x10ffff>));
        }

        wstream << static_cast<wchar_t>(0xfeff);
        wstream << wstr;
      }
      else
#endif
      {
        std::ofstream stream;
        stream.exceptions(std::ofstream::failbit | std::ofstream::badbit);
        stream.open(mPath, std::ios::binary | std::ios::trunc);
        WriteCsv(stream);
      }
    }

    void WriteCsv(std::ostream& pStream) const
    {
      for (auto itr = mData.begin(); itr != mData.end(); ++itr)
      {
        for (auto itc = itr->begin(); itc != itr->end(); ++itc)
        {
          if (mSeparatorParams.mAutoQuote &&
              ((itc->find(mSeparatorParams.mSeparator) != std::string::npos) ||
               (itc->find(' ') != std::string::npos)))
          {
            // escape quotes in string
            std::string str = *itc;
            const std::string quoteCharStr = std::string(1, mSeparatorParams.mQuoteChar);
            ReplaceString(str, quoteCharStr, quoteCharStr + quoteCharStr);

            pStream << quoteCharStr << str << quoteCharStr;
          }
          else
          {
            pStream << *itc;
          }

          if (std::distance(itc, itr->end()) > 1)
          {
            pStream << mSeparatorParams.mSeparator;
          }
        }
        pStream << (mSeparatorParams.mHasCR ? "\r\n" : "\n");
      }
    }

    size_t GetDataRowCount() const
    {
      return mData.size();
    }

    size_t GetDataColumnCount() const
    {
      return (mData.size() > 0) ? mData.at(0).size() : 0;
    }

    inline size_t GetDataRowIndex(const size_t pRowIdx) const
    {
      return pRowIdx + static_cast<size_t>(mLabelParams.mColumnNameIdx + 1);
    }

    inline size_t GetDataColumnIndex(const size_t pColumnIdx) const
    {
      return pColumnIdx + static_cast<size_t>(mLabelParams.mRowNameIdx + 1);
    }

    std::string Trim(const std::string& pStr) const
    {
      if (mSeparatorParams.mTrim)
      {
        std::string str = pStr;

        // ltrim
        str.erase(str.begin(), std::find_if(str.begin(), str.end(), [](int ch) { return !isspace(ch); }));

        // rtrim
        str.erase(std::find_if(str.rbegin(), str.rend(), [](int ch) { return !isspace(ch); }).base(), str.end());

        return str;
      }
      else
      {
        return pStr;
      }
    }

    std::string Unquote(const std::string& pStr) const
    {
      if (mSeparatorParams.mAutoQuote && (pStr.size() >= 2) &&
          (pStr.front() == mSeparatorParams.mQuoteChar) &&
          (pStr.back() == mSeparatorParams.mQuoteChar))
      {
        // remove start/end quotes
        std::string str = pStr.substr(1, pStr.size() - 2);

        // unescape quotes in string
        const std::string quoteCharStr = std::string(1, mSeparatorParams.mQuoteChar);
        ReplaceString(str, quoteCharStr + quoteCharStr, quoteCharStr);

        return str;
      }
      else
      {
        return pStr;
      }
    }

    void UpdateColumnNames()
    {
      mColumnNames.clear();
      if ((mLabelParams.mColumnNameIdx >= 0) &&
          (static_cast<ssize_t>(mData.size()) > mLabelParams.mColumnNameIdx))
      {
        size_t i = 0;
        for (auto& columnName : mData[static_cast<size_t>(mLabelParams.mColumnNameIdx)])
        {
          mColumnNames[columnName] = i++;
        }
      }
    }

    void UpdateRowNames()
    {
      mRowNames.clear();
      if ((mLabelParams.mRowNameIdx >= 0) &&
          (static_cast<ssize_t>(mData.size()) >
           (mLabelParams.mColumnNameIdx + 1)))
      {
        size_t i = 0;
        for (auto& dataRow : mData)
        {
          if (static_cast<ssize_t>(dataRow.size()) > mLabelParams.mRowNameIdx)
          {
            mRowNames[dataRow[static_cast<size_t>(mLabelParams.mRowNameIdx)]] = i++;
          }
        }
      }
    }

#ifdef HAS_CODECVT
#if defined(_MSC_VER)
#pragma warning (push)
#pragma warning (disable: 4996)
#endif
    static std::string ToString(const std::wstring& pWStr)
    {
      return std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t>{ }.to_bytes(pWStr);
    }

    static std::wstring ToWString(const std::string& pStr)
    {
      return std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t>{ }.from_bytes(pStr);
    }
#if defined(_MSC_VER)
#pragma warning (pop)
#endif
#endif

    static void ReplaceString(std::string& pStr, const std::string& pSearch, const std::string& pReplace)
    {
      size_t pos = 0;

      while ((pos = pStr.find(pSearch, pos)) != std::string::npos)
      {
        pStr.replace(pos, pSearch.size(), pReplace);
        pos += pReplace.size();
      }
    }

  private:
    std::string mPath;
    LabelParams mLabelParams;
    SeparatorParams mSeparatorParams;
    ConverterParams mConverterParams;
    LineReaderParams mLineReaderParams;
    std::vector<std::vector<std::string>> mData;
    std::map<std::string, size_t> mColumnNames;
    std::map<std::string, size_t> mRowNames;
#ifdef HAS_CODECVT
    bool mIsUtf16 = false;
    bool mIsLE = false;
#endif
  };
}

[d99kris]

Hi @hpark90 - thanks for the suggestion and proposing a fix. However the implementation above breaks some existing functionality (and tests - for example custom converstion by template specialization in test036). I suppose it could be possible to instead do private templated helpers for ToStr and ToVal respectively, but I'm not sure if there will be other issues. I don't have time to look into this now, but I'll try to come back to this request eventually and see how/if it can be supported.

[hojthehedgehog]

@d99kris I see the following tests are failing.

         35 - test035 (Failed)
         48 - test048 (Failed)
         49 - test049 (Failed)

35 -> failing because test035.cpp is actually overriding ToVal, ToStr function for int. I'm not sure what this means that you override the production function in the test file and test the new function
48,49 -> failing because I didn't write exception handling cases in the new template specialization functions.

So I think my suggested update actually is working just fine.

[d99kris]

Regarding test035 it's a documented functionality allowing users to override ToVal and ToStr. Ideally I would prefer not breaking backward compatibility. Or at least not removing without providing an equivalent functionality.

[d99kris]

I will proceed to close this request for now, due to the above stated reasons. If an alternative approach is found which does not break backward compatibility, please submit a PR for consideration. Thanks!